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SELECTION OF VVVF DRIVE FOR HOIST


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#1 dip04051978

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Posted 17 January 2004 - 11:31 AM

WE HAVE TO SELECT DRIVE SIZE FOR FOLLOWING SYSTEM.

THERE ARE TWO MECHANISM 100% RATED FOR HOISTING. ONE SYSTEM IS BACKUP FOR THE OTHER SYSTEM. IF ONE FAILS DUE TO ANY REASON OTHER WILL TAKE CARE. ANY OF THE SYSTEM TAKES THE FULL LOAD. THE DETAILS AS UNDER:

MECH.KW: 44.93
ELECT.KW: 47.3
SELECTED KW: 55

THERE ARE TWO 55 KW MOTOR IN PARALLEL. TO CONTROL THIS LOAD, WHAT WILL BE THE VVVF DRIVE RATING. IS 1NO. 55KW DRIVE IS SUFFICIENT OR I HAVE TO GO ONE HIGHER SIZE?? THANX IN ADVANCE.
MY EMAIL ID IS dip04051978@yahoo.com

#2 jraef

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Posted 02 February 2004 - 08:22 AM

Prudent engineering would suggest that if you want redudancy for the relaibility of the system, have redundancy in the drive as well. In other words, you have spent the money to have a backup mechanical system. While one 55kW rated drive and a way of switching it to either motor would work, if the drive fails you have nothing!
"He's not dead, he's just pinin' for the fjords!"




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